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(A) Capsule staining of EFa02, EFa02R, and EFa02R::gtr2. Capsule staining showed that EFa02 and EFa02R::gtr2 have the capsule, but EFa02R lost the capsule. (B) The biofilm mass of EFa02R was less than those of EFa02 and EFa02R::gtr2 (*p < 0.05) at the given time points.
